超精超稳超敏捷卫星在航天器星体平台的基础上引入二级控制主动指向超静平台（ASP）实现了载荷的振动隔离与敏捷机动。载荷与卫星平台之间的附加连接可能导致系统指向精度与隔振效果的下降。为此，利用仿真与试验分析研究了线缆、热管等附加连接对主动指向超静平台控制性能的影响。首先，利用牛顿-欧拉方法建立了超精超稳超敏捷卫星多级动力学模型，将线缆、热管连接等效为附加刚度，建立附加连接的力学模型，为分析附加连接对系统产生的影响提供动力学基础。其次，仿真分析了附加连接对系统隔振效果、稳定性的影响，为实际卫星的设计与测试提供理论支持。为进一步掌握附加连接的刚度特性和对系统控制性能产生的影响，设计对主动指向超静平台开展控制系统的全物理仿真试验。试验结果表明，采用试验中线缆、热管的装配布局对主动指向超静平台控制的稳定性、指向精度与稳定时间均无明显影响，试验中线缆、热管的装配布局对整星的安装设计有重要参考意义。最后，提出了一种自适应预设性能非线性控制器，解决了附加刚度存在下平台与载荷之间的耦合与振动抑制问题，数值仿真结果显示，提出的自适应预设性能控制改善了载荷与平台之间的动力学耦合问题，进一步提升了载荷的敏捷机动、稳定跟踪与高精度指向能力。

Ultrahigh precision ultrahigh stability ultra-agile multi-stage satellites are implemented by introducing a two-stage control ultra-Agile ultra-Stable and ultra-Pointing platform （ASP） to the spacecraft platform. The ASP isolates the vibration and enables rapid maneuver ability of payloads. Additional connection may degrade the pointing accuracy and capability of vibration isolation； therefore， numerical simulation and an experiment examining the control performance of the ASP system with cable and heat pipe additional connection are conducted. The Newton-Euler method is used to establish a multi-stage dynamic system. A mechanical model laying the foundation for effect analysis of the cable and heat pipe additional connection on the system is established. Numerical simulation is implemented to analyze the effect of additional connection on vibration isolation and stability of the system， providing theoretical support for satellite design and test. To gain more precise understanding of the effect of the additional connection， a full physical experiment is designed and conducted on the ASP control system. The result shows that the assembly layout of the cable and heat pipe additional connection has little effect on stability， pointing accuracy and setting time of the ASP control system. The assembly layout of the cable and heat pipe in the experiment provides a significant reference value and practical meaning for satellite design. An adaptive nonlinear control law with prescribed performance is proposed for dynamic coupling between the payload and platform. The simulation result shows that the controller considerably reduces the dynamic coupling and further improves the ability of fast maneuver， stable tracking and high precision pointing.